89 chevy 2500 wont go into overdrive

Discussion in 'Chevy Truck Forum' started by justinc87, May 16, 2010.

  1. justinc87

    justinc87 Member

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    I bought a 89 silverado from my grandpa for $500, he said i'd have to get it running right though. My problem is that it wont go into overdrive, the truck just sits idle and will rev up as if it were still in neutral. When I put it in drive the truck will run but has a hard time shifting. A mechanic friend of mine said it's probably a sensor problem( at least for the overdrive). I'm not sure if the shifting is the same problem. Anyone have any ideas or things I can try?
     
  2. Boudin

    Boudin Forum Moderator

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    I'm assuming you have the 700R4 transmission, right?
     
  3. Boudin

    Boudin Forum Moderator

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    Sorry, I just noticed you said it was a 3/4 ton. I don't think the 700R4 would be in anything but a 1/2 ton.

    Do you know what transmission it has in it?
     
  4. justinc87

    justinc87 Member

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    I would think so, sad to say this is my first older chevy truck so i'm still familiarizing myself with them. It's whatever came stock with it haha.
     
  5. wyochimneysweep

    wyochimneysweep Senior Member

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    gas or diesel?
     
  6. wyochimneysweep

    wyochimneysweep Senior Member

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    does reverse work
     
  7. justinc87

    justinc87 Member

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    It's gas, it's got the 350 in it. It does go in reverse. All gears work fine except the drives, overdrive does nothing and drive struggles to shift.
     
  8. Hwy64

    Hwy64 Full Member

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    89 chevy 2500

    Well, the '89 Chev. and GMC 3/4 vans definitely did have 700R4s in them. Got two. Also have an '89 Chev 1 ton van that has a T400 in it with the 350 TBI.
     
  9. oldford

    oldford Full Member

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    I've got an 89 k2500 with a rebuilt 700r4 in it that had the same symptoms. It's time for a trip to the transmission shop.

    GL, eric
     
  10. wyochimneysweep

    wyochimneysweep Senior Member

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    sticking throttle vavle? they have a junior shift kit that will fix the stickie vavle.
     

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